Breeding patterns and behaviors vary greatly in the genus Apistogramma, from forming strong pair bonds in A. steindachneri to almost exclusively haremic in A. cacatuoides and A. trifasciata. If I remember correctly, there is even at least one facultative mouth brooder. I believe A. borelli exhibits a fair amount of plasticity in breeding behavior, adapting to a pair or harem breeding strategy depending on circumstance. Honestly, your best bet for good information is to search Google Scholar for papers on apistogramma breeding behaviors as well as to look at and search a more focused web site, such as apistogramma.com.
Generally, haremic species should have a m:f ratio of 1:3, allowing for a territory of approximately 150 to 200 sq inches per female, and the male's territory will overlap the females'. Pair bonding species have a 1:1 ratio, obviously, and should provide for 200 to 250 sq inches per pair. I have very little practical experience with apistos, though I have researched a number of species I have considered keeping, and am relying completely on what I know about the species I've researched and general published knowledge about the genus, primarily on the husbandry of commonly kept species. Hope this helps.
WYite